linux-kernel - [PATCH] f2fs: convert inline_data in prior to i_size

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Date:   Fri, 30 Aug 2019 08:34:53 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH] f2fs: convert inline_data in prior to i_size_write

This can guarantee inline_data has smaller i_size.

Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
 fs/f2fs/file.c | 25 +++++++++----------------
 1 file changed, 9 insertions(+), 16 deletions(-)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 08caaead6f16..a43193dd27cb 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -815,14 +815,20 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 
 	if (attr->ia_valid & ATTR_SIZE) {
 		loff_t old_size = i_size_read(inode);
-		bool to_smaller = (attr->ia_size <= old_size);
+
+		if (attr->ia_size > MAX_INLINE_DATA(inode)) {
+			/* should convert inline inode here */
+			err = f2fs_convert_inline_inode(inode);
+			if (err)
+				return err;
+		}
 
 		down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
 		down_write(&F2FS_I(inode)->i_mmap_sem);
 
 		truncate_setsize(inode, attr->ia_size);
 
-		if (to_smaller)
+		if (attr->ia_size <= old_size)
 			err = f2fs_truncate(inode);
 		/*
 		 * do not trim all blocks after i_size if target size is
@@ -830,24 +836,11 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
 		 */
 		up_write(&F2FS_I(inode)->i_mmap_sem);
 		up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
-
 		if (err)
 			return err;
 
-		if (!to_smaller) {
-			/* should convert inline inode here */
-			if (!f2fs_may_inline_data(inode)) {
-				err = f2fs_convert_inline_inode(inode);
-				if (err) {
-					/* recover old i_size */
-					i_size_write(inode, old_size);
-					return err;
-				}
-			}
-			inode->i_mtime = inode->i_ctime = current_time(inode);
-		}
-
 		down_write(&F2FS_I(inode)->i_sem);
+		inode->i_mtime = inode->i_ctime = current_time(inode);
 		F2FS_I(inode)->last_disk_size = i_size_read(inode);
 		up_write(&F2FS_I(inode)->i_sem);
 	}
-- 
2.19.0.605.g01d371f741-goog